PLANIBEL ENERGY N is a high performance coated glass manufactured by magnetron process. It has a double invisible, ultra-thin layer of silver, which reflects the sun's heat whilst letting in light. Its excellent solar factor of 42% means that 58% of the solar heat is kept out by the glass. It therefore helps keep the ambient temperature at a comfortable level, even at the height of summer. PLANIBEL ENERGY N is a high performance low emissivity glass. It has the exceptional ability to retain the heat produced inside the building and reduces heat loss, thereby ensuring excellent thermal comfort in cold climate. With impressive U-value of 1.2 W/m2.K, this innovative product offers maximum thermal insulation, reducing heating costs by up to 68%. With a view to making the energy savings required under the Kyoto agreements, many governments are so convinced by the impressive U-value of low emissivity glass that they have made its use compulsory.